Question

我有User模型和Message模型。我的message表包含created_for列和created_by列，这些列都是User表的外键。

我目前收到此错误消息：

对于#`

，

undefined method created_for_id'

如何在不将列更改为created_for_id和created_by_id的情况下将其生效？

class User < ActiveRecord::Base

    has_one :message
end

class Message < ActiveRecord::Base

    #belongs_to :user
    belongs_to :created_by, :class_name => "User" # Basically tell rails that created_by is a FK to the users table
    belongs_to :created_for, :class_name => "User"  # Basically tell rails that created_for is a FK to the users table

    attr_accessible :created_by, :created_for, :message

end

Answer 1

您可以通过以下方式指定belongs_to的外键：

belongs_to :created_for, class_name: 'User', foreign_key: :created_for

我怀疑您将遇到一个问题，即关系名称和外键属性共享一个名称。这是belongs_to文档，向下滚动到“选项”

当显式指定时，Rails模型外键不起作用

1 个答案: